Moon in 4th house in Astrology is one of the best positions for the Moon since this is the original house of the Moon, and Moon feels at home. This is the house of home life and house of mother. Moon in 4th House in Vedic Astrology makes life blessed with Moonshine, as the person has a good relationship with the mother, father, and siblings. Married life, too, is blessed for this person.
4th House in Astrology represents a person's home, family life, ownership of the home and vehicles, peace of mind, childhood, teachings of your mother, grade school, and any conveniences. Having an air conditioner is also considered a 4th house object since it represents convenience.
The fourth house in Vedic Astrology represents the full awareness of having a home and mother, which are the next significant experience. The home environment and extensive interaction with the mother cultivate a frame of mind and emotions. The mind and emotions are, in turn, the basis for happiness.
Physically, next in line is the chest, including the heart and lungs. The signification of the heart reinforces the significance of emotions.
The correspondence with Karka (Cancer) adds a connection with water and bodies of water and again reinforces the signification of mind and heart.
Moon in Astrology shows the way you think and react to the situation. How emotional or unemotional you are depending upon the condition of the Moon. The Moon is also a watery planet, as it controls the sign of Cancer. The Moon controls the government. Since it is not as strong as the Sun, it represents our local or state government versus the federal government.
Moon in Vedic Astrology represents your mother, or motherly figures, your emotional response to your environment, and your imagination since the Moon is your mind. The Moon shows the way you think and react to a situation. A good moon in your horoscope or birth chart in astrology will make the following things benefic or auspicious, i.e., your relationship with your mother, and your mind will be calm & you will be a creative being. If the moon is unfavourably placed in your horoscope, then it may ruin the relationship with your mother.
Note: The degree of auspiciousness and inauspiciousness will depend upon a complete analysis of the horoscope (birth-chart).